IAPHUB will now send the iOS/Android promo code the user used during a purchase!
promoCode property will be sent on a purchase webhook or when fetching a purchase from the API.
And the promo code will also be displayed on the IAPHUB dashboard when clicking on a transaction.
Google only returns the promo code for subscriptions vanity codes (not available for one time codes).
Also for iOS the
promoCode property will contain the offer reference name you've provided when creating a promo code on iTunes.